Method of conserving the heat and pulp from pulp-drying machines



June 24, 1930. s. NORMAN METHOD OF CONSERVING THE HEAT AND PULP FROM PULP DRYING MACHINES Filed Jan. 29, 1929 (htm um? Patented .lune 24, 1.93()

UNITED s'raxrlasA PA-TENT OFFICE SIGUBD NORMAN, F NEWBERG, OREGON METHOD 0F CONSEBVING THE HEAT AN'D PULP FROM PULP-DRYING MACHINES Application med January 2s, 1929. serial No. 385,993.

The primary object of m l new and improved process is to increase e capacity of a pulp drying machine.

A further object of my new and improved' 5 method consists in conserving theheat used in a pulp drying machine and making the same available for use.

A further object of my new and improved method consists in conserving pulp losses 1o heretofore exhausted from pulp and paper making machines.

A further object of my new and improved lmethod is to make the room of the pulp drying machine of a pulp plant, in which the drying machine is dis osed, more healthful place for workmen w e en aged in their duties, as pulp makers, by ehminating dust and ulp particles from the air of the room.

e device consists primarily of a .con-

densing chamber through which the heated air leading from the drying machine, which at the present time is normally exhausted into the air, is passed in a heated condition and a chamber in which water jetsare rechamber progressively, to precipitate the pulp particles carried in the air, to extract the heat disposed in the air and utilize the same for heating the water to be used in the pulp mass and thereby admita warmed pulp mass to the drying machine.

As a superintendent of pulp mills, I have observed that the drying process may be greatly speeded up andV therefore the capacity of the drying machine be increased when warm pulp is admitted into the dryin machine. The primary reason for this ing that if highly heated air is admitted into the drying machine at the entrance end of the to remain within the drying machine; whereas, if a warmed sheet made from warm water is admitted into the machine, the drying process may be greatly speeded up. The

leased in compartments of the condensingY pulp sheet into the machine, and if the pulp utilization of the heat formerly exhausted from the drying machine to the atmosphere is suicient when extracted to warm the water, so that a warm pulp sheet is made and Y admitted into the drying machine. The passing of the exhausted air from the drying machine through the condenser and water jets released in the various compartments precipitates particles of pulp carried in suspension in the air which is returned to the mixing vat. 6o

With these and incidental objects in view, the invention consists in certain novel features 'Y of construction and combination of parts, the essential elements of which are set forth in the appended claim, and a preferred form of embodiment of which is hereinafter shown with reference to the drawings which accompany and form a part of this specification.

Y I have illustrated in the drawings, suitable mechanism that may be utilized in the carrying out of my new and improvedprocess, 1n which:

Fig. 1 is a side view of a pulp drying machine and illustrating the source of supply from which the pulp mass is received and the I machine for forming the pulp sheet.

Fig. 2 is a cross esction view of the con- Ilensing chamber.

Fig. 3 is a cross section view, taken on line so 3-3dof Fig. 2, looking in the direction indicate Like reference characters refer to like parts throughout the several views.

1 is the mixing vat into which the pulp mass 85 is admitted in a relatively cold state, the same is mixed and warmed -in the vat and is then pumped through a pump 2, into a vat 3 in which the sheet forming machine 4. is disposed. The sheet is delivered into the entrance end 5 of the drying machine 6. Airis induced into the drying machine through the fans 7 The drying machine is of the usual. type for heating the air admitted into the drying machine.` I place a condensing cham-l 05j' ber. 8 adjacent the drying machine and ex-l. Y

haust the air therefrom through the outlet 9" leading 4ronithe drying machine into the condenser 8. The con'denser Sis divided into a. plurality compartments by baille walls embodiment in various 10 and water for condensing is admitted through the inlet pipe 11 and is released in a fine spray from the discharge head 12. The same is collected within the base of the con-k denser and iiows by gravity into a pressure pump 13 where suilicient pressure is developed to respray the water through a second spray head 13 where it is again collected within the base of the condenser and passes to a second pressure pump 14 and it is again redistributed through the pressure head 15.

I have here shown three sprays bein disposed within the condensing chamber, ut I do not wish to be limited to any number of sprays, as the number of sprayings should be suilicient to extract the heat disposed within the air admitted into the chamber. A multiple of compartments ma be required depending upon the capacity o the drying machine. The warmed water containing the precipitated particles of pulp are passed through the pipe 16 to the mixing vat 1 thereby providing cated water containing the precipitate pulp mass in suiiicient quantity to warm the pulp from which the sheet is made.

While the form of mechanism herein shown and described is admirably adapted to fulfill the objects primarily stated, it is to be understood that it is not intended to confine the invention to the one form of embodiment herein shown and described, as it is susceptible of forms all coming within the scope of the claim which follows.

What I claim is:

The herein described continuous method of utilizing the heat of a drying chamber and retrieving the pulp particles held in suspension by the heated vapor consisting in driving the vapors into a condensing chamber, spraying water upon the vapors, utilizing the spent spray a plurality of times, and finally conducting the condensed vapors and retrieved matter in a warm condition to a mixing chamber.

SIGURD NORMAN. 

